Diamond wheel dresser



June 17, 1947. E. BROCKER DIAMOND WHEEL DRESSR y Filed Feb. 5, 1944 ELrJune 17, 1947. E', BROCKER 2,422,220 I DIAMOND WHEEL DREssER l FiledFeb. 5, `1.9411; 2 Sheets-Sheet 2 5M INVENToR.

E E FM he@ Patented June 17,1947

DIAMOND WHEEL DnEssEn Emil Brooker, Van Dyke, Mich., assignor to SuperTool Company, Warren Township, Macomb County, Mich., a partnershipApplication February 3, 1944, Serial No. 520,914

1 Claim.

This invention relates to dressing devices and particularly to a motordriven dressing wheel and its adjustable support by which angularlydisposed faces are dressed upon grinding wheels.

Difculty has been experienced in the past when attempting to dress theface of a diamond grinding Wheel at an angle other than at right anglesto its plane of rotation. Since diamond impregnated grinding wheels arenow being used extensively for grinding threads and other formsrequiring a predetermined angular face on the wheel, no means hasheretofore been provided for accurately dressing the impregnated Wheelin a simple operation.

The present invention embodies a dressing device having a base and aplatform which are joined together by a pintle about which the platformmay be adjusted at any angle relative to the base. The base isconstructed of steel, or other magnetic material, so as to be supportedon a magnetic table and is provided with apertures by which it may bebolted to tables or other types of grinding machines. The platformsupports a cradle on which a motor is secured and a lead screw advancesthe cradle on the platform against i relative direction of rotation ofthe dressing wheel changes when the dressing wheel is swung from one tothe other side of the central plane of the grinding wheel. The motor ispreferably of the high speed type, operating at approximately 6,000

R. P. M. and developing substantially 1/e of a horsepower.

Clamping means are provided on the base by which the pintle is securedafter the angular position of the platform has been adjusted. An indexscale is provided on the wall of the pintle by which the angularposition may be set or checked. The pintle is positioned near one end ofthe platform and base, ahead of the motor, so as to have the dressingwheel disposed approximately in line with the pintle axis.

Accordingly, the main objects of the present invention are: to provide adressing device with a base by which it is attached to a table and witha platform having a pivotal connection with the base, on which a motoris advanced and retracted; to join a. platform to a base by a pintleabout which they are angularly adjusted and mount a motor for axialmovement on the platform; to mount a motor for axial movement on thetopof a platform and provide a lead screw therebelow for moving the motor,all of which is supported by a pintle on a base which is attachable toatable of a grinding machine adjacent to the wheel to be dressed; and,in general, to provide a dressing device for dressing angular faces on adiamond impregnated grinding wheel, which is simple in construction,positive in operation and economical of manufacture.

Other objects and features of novelty of this invention will bespecifically pointed out or will become apparent when referring, for abetter understanding of the invention, to the following descriptiontaken in conjunction With the accompanying drawings, wherein:

Figure 1 is a perspective View of a dressing'device embodying featuresof this invention;

Fig. 2 is a broken sectional view of the structure illustrated in Fig.1, taken along line 2-2 thereof;

Fig. 3 is a sectional view of the structure illustrated in Fig. 2, takenon the line 3-3 thereof;

Fig. 4 is a view of the structure illustrated in Fig. 2 as observed fromthe line 4 4 thereof; and,

Fig. 5 is a broken View of structure similar to that illustrated in Fig.2, showing a modified for thereof. 1

The dressing device of the present invention embodies a base I0 which ismade of magnetic material so as to be securable in fixed position, whenmounted upon a magnetic chuck of a grinding machine table. The base isals/o provided with bolt receiving recesses I2 by which the device maybe securely clamped to non-magnetic tables of other types of machines.Threaded apertures Id are also provided in the base by which the basemay be secured to tables of still other types of machines having boltswith vwhich the apertures are aligned.

The base has a pintle i6 secured thereto for angular adjustment thereon.The pintle is provided with trunnions I8 and 20, the latter of whichprojects within an aperture 22 of a-truncated conical plate 24, whichmates within the truncated conicall aperture 25 at the forward end ofthe base IU. A pair of screws 28 clamp the pintle i5 to the plate 24 toprovide frictional engagement therebetween. The trunnion I8 projectslinto an aperture 30 of a platform 32 which is secured to the pintle bya plurality of screws 3ft. The platform is adjustable with the pintle onthe base l0, the adjustment being set or checked acteristics outlinedabove,

by an index scale 36 on the pintle surface from v index marks 38 on thebase. The scale may extend from to 90 and from 90 back to 0, so that theindex marks 38 may be disposed on both sides of the base and at thefront edge halfway therebetween. By constructing the scale in thismanner, the setting may be read on either side or at the front of thedevice.

The platform has a gib 40 machined thereon and a second gib 42 issecured in position byra plurality of screws 44. The gibs encompass adove tail base 46 on a carriage 48 on which .a motor 50 is secured by aplurality of screws not herein illustrated. The carriage supports .a pin52 which is secured in position by ascrewli. The pin operates in a slot56 extending through the platform 32. The end of Vthe pin has aprojecting finger 53, brazed or otherwise secured thereto, which is madeof extremely hard material to prevent wear. The pin projects within ahelical slot 610 disposed in a cylinder E2, the ends of which aremounted in brackets 64 supported on the underside of the .platform 32 bythe screw-s 65. A shaft 88 on `the cylinder 162 is journaled in thebrackets 164 on the end of the platform opposite to that to which thepintie IE6 is attached. The shaft 8 is connected by a block 'I0 to anoperating handle 12. When the handle is operated to rotate. the shaft68, the helical slot 60 causes the projets tion '58 and pin 52 tomoveaxially of the cylinder 2 to thereby advance the carriage' 48 towardAthe end .of the platform to which the pintle I is attached.

The motor lis of conventional form, being of the reversible type andoperating at approximately 6,000 R. P. M. when developing substantiallygg of .a horsepower. Itis to be understood that nonreversing motors andAthose of higher and low-.er speeds and horsepower ratings may beemployed in place .of the motor having the particular char- The motorv5l) comprises a casing T5, a stator and rotor (not shown) fromv which ashaft 18 extends from the forward end. The forward end of the casing isenclosed by a bracket 80 havhi-g a bearing supporting element 32 in 'theleft-hand end for supporting a bearing 84 hear the end of the shaft 13.A pair of bearings a6 are mounted near the front end of the bracket forengaging a :dressing wheel-supporting shaft 88.

Collars 90 are mounted on the adjacent ends of the Vshafts I8 and 48f3.having on their adjacent faces a pair of projecting pins 92, Athe planesthrough thosepon each collar being olf-set 9.0o to each other. The pinsproject into .apertures in `a resilient disc '94 made of rubber,leather, or similar flexible material. The disc provides'universalconnection between the two shafts and prevents vibration from beingtransferred from the motor to a grinding disc 9.5. The grinding disc 95is supported on a shaft 96 which projects from the shaft `813 and isretained .in clamped .position by a screw 98. The bearings 86 areretained in spaced relation by a collar |00 and are maintained inforward position by a sp1-it washer H12. Thegpiatform has aU-shaped-slot 109 cut in its-top surface extending from the left handend,

as viewed in Fig. 2, toward the pintle I8. A spring -III operate'swithinthe slot 409 yone end being secured to a pin H2 projecting from theunder surface vof theY dovetailed base l45,;the other .end being securedby a pin II3 which extends ,across the metal at the Vend of the slot.The tension in the spring urgesthe platform lIB'to the left, whichmovement is interrupted by the stop plate lI4 i secured by screw I I5 tothe end of the platform 32.

A split tube II6 encompasses the cylinder 62 when the ends are supportedin recesses I I1 provided in-the brackets 64. The projecting finger 58extends in the slot in the tube in which it moves as the platform 48 isadvanced or retracted.

Between the gib 42 and the dovetailed base 46 an adjusting shim II9 isprovided fortaking up any wear which may occur between the gibs and thebase. Screws I2I projecting through the `gib 42 adjust the position ofthe shim and after the adjustment has been made the screws are locked inadjusted position by the nuts |22.

A clamping screwy |23 is provided in .the base, which operates directlyupon the plate 23, or through a brass plug, to prevent the marring ofthe truncated conical surface thereof, when securing the plate to thebase when the platform` is adjusted. To prevent grinding particles .fromfalling into the movable parts of the device and causing unnecessarywear, a cover element I24 is secured to the platform 4B by the vscrewslI 25. The ele-ment extends over the top and sides of the platforms andtherebeyond, to maintain the platform 32 covered when the platform 48 isin advanced position. y

When it is desired to dress a diam-ond impreg nated wheel of a grindingmachine, the base I0 is first placed upon the table of the machine andsecuredl in predetermined position thereonfby suitable means which maybe a magnetic chuck, bolts, screws, clamping bars, `or any other meanssuitable for retaining the base irmly secured to the table. The axis ofthe base is preferably dis posed parallel to Ythe direction of movementof the table so that the base ymay be oriented relative tothe grindingwheel and the dressing Wheel may be set off to a desirable angle by theuse of the scale 35. After the device has been accurately set, the motor5B and dressing wheel 94 are operatedY at high speed and the wheel ofthe grinding machine is rotated, the wheels at their point of engagementoperating in opposite directions. The carriage of the machine isadjusted to bring the wheel into desired position and is advanced at anangle across the face to be dressed by the manipulation of the handlel2.Y After a face is dressed toa predetermined angle on one side of thewheel, the platform 32 is moved angularly on the Vbase to bring thewheel into position on the opposite side of the grinding wheel. Themotor is reversed to have the wheels operating at their point ofengagement in lopposite directions and the handle 12 is manipulated topass the dressing wheel across the grinding wheel face.Y After thedressing operatiomthe device may be removed from the carriage by thesimple expedient of in-V The bearings Yare spaced by a sleeve 134through. c

which the shaft 11:21 extends. When the nut |53 is tightened thepressure is applied through the outer to the inner 'race-way' of Vthebearing Y|28 throughV the sleeve |134. to the inner and cuter raceway ofthe bearing 129 to preload the bearings. The adjustment of the nut 132retains the shaft I21 against longitudinal movement rela- 5 tive to thebearings. The universal drive connection through the rubber or likeelement 94 is provided between the motor shaft and the shaft |21.

What is claimed is:

A dressing device including, in combination, a motor, a support for saidmotor, a platform on the top of which said support is movable, means onthe underside of said platform for moving said support, a spring forreturning said platform to its initial position, a base, a pivot joiningsaid base and platform forwardly of said motor, a shaft mountedforwardly of said motor and supported thereby, and a universal connectorjoining said shaft to said motor.

EMIL BROCKER.

REFERENCES CITED The following references are of record in the le ofthis patent:

Number UNITED STATES PATENTS Name Date Sunnen Jan. 26, 1943 Rennie Dec.30, 1919 Oliver Apr. 1, 1930 Curtis May 31, 1938 Fisher Dec. 2, 1919Bright Deo. .31, 1918 Warner July 12, 1910 Severson Mar. 13, 1928Levesque Nov. 28, 1939 Bryant Jan. 14, 1919 Arms Aug. 16, 1932 FOREIGNPATENTS Country Date Great Britain Apr. 7, 1921

